Sustainability

· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.

SCORE

GRADE

FIX

REVIEW

PASS

INFO

Device:

Mobile Desktop

Checks

2 PASS 2 REVIEW 3 FIX

CO2 Per Page Load

Action

2.00g CO2 per view

FIX

2.00g CO2 per view

2.00g CO2 per page view

This page transfers 7.1 MB, producing an estimated 2.00g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.37g, network 0.35g, end-user device 1.28g.

Got: 2.00g CO2 Expected: < 0.50g (sustainability target)

At 10,000 monthly views: 240.0 kg CO2/year

With 10,000 page views per month, this page would generate approximately 240.0 kg of CO2 annually — equivalent to charging 29996 smartphones.

2.00g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 11% of websites

Sustainable Web Design model v4 · Page size: 7.1 MB

Your site

2.00g

Top 10%

0.20g

Target

0.50g

Median website

0.60g

Energy Breakdown

Data center

0.37g

Network

0.35g

End-user device

1.28g

At 10,000 monthly views: Monthly: 20.0 kg · Annual: 240.0 kg · ≈ 29996 smartphone charges

Green Hosting

Action

Unknown

FIX

Unknown

Hosting provider could not be identified

Without knowing the provider, we cannot determine their energy sourcing. Check with your hosting provider about their renewable energy commitments.

Green hosting status based on known provider commitments

Green hosting detection uses a curated database of provider renewable energy commitments. This is not a real-time verification. For authoritative checks, visit thegreenwebfoundation.org.

Green HostingUnable to Determine

Hosting Not identified✗CDN Not identified✗

Based on known provider commitments. Verify at thegreenwebfoundation.org

Carbon Budget

Action

89th percentile

FIX

89th percentile

2.00g CO2 — above the median website (0.60g)

Heavier than an estimated 11% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.

Estimated 89th percentile

Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.

Top 10%

Target

Median website

2.00g

89th percentile

Cleaner than 11% of websites

✗ Above the median website

vs Median 233% more

vs Target 300% more

Transfer Efficiency

81% efficient

REVIEW

81% efficient

Transfer efficiency: 81%

An estimated 1378 KB (19%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1378 KB of unused JavaScript. This wasted data produces 0.38g of unnecessary CO2 per page view.

Total waste: 1378 KB (19% of page weight)

Unused JS 1378 KB

0.38g unnecessary CO2 per visit

Actual transfer 7230 KB

Theoretical minimum 5852 KB

Potential savings 1378 KB (0.38g CO2)

See Deep Analysis sections above for specific optimizations.

Green Hosting

Action

Whether the site is served from green-energy infrastructure

REVIEW

Green Hosting

No green hosting detected

A+

Repeat Visit Weight

99% cached

PASS

99% cached

99% reduction on repeat visits

Returning visitors download only 88 KB (vs 7230 KB first visit). 113 of 115 resources are served from browser cache, saving 1.98g CO2 per repeat visit.

Repeat visit: 0.02g CO2 (first visit: 2.00g)

First visit

7230 KB

Repeat visit

88 KB

99% reduction on repeat visits

Saving 1.98g CO2 per returning visitor

113 resources served from cache · 2 resources re-downloaded

A+

Web Font Weight Variants

2 font weights loaded across 2 famil(y/ies) -- reasonable

PASS

2 font weights loaded across 2 famil(y/ies) -- reasonable

2 font weight(s) loaded across 2 famil(y/ies)

Image Optimization

14 images, 2212 KB total, 1830 KB wasted

INFO

Image Optimization Audit

Total Images

Total Size

2212 KB

Oversized

Wasted

1830 KB

14 missing dimensions 4 missing lazy loading

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.